THERMOSTAT 7C9008 - Caterpillar

Illustration 1 g01277292
Controls Cabinet Left Panel (17) Breaker and Contactor Status Board (18) Remote EPO Terminal Block (19) T8 Modem Power Transformer (20) T6 Transformer (21) General Purpose Interface Board (22) Fan Power Fuse Block (23) Fuses F29-F32 (24) Fuses F20-F22 (25) Fuses F25-F28 (26) EPO Reset (27) Neutral Distribution Terminal (28) K1 Motor Power Relay (K9)The 230/115VAC External Modem Power Transformer (T8) is powered from the output of the UPS and converts AC voltage to the appropriate level for operating the modem located in the upper Controls cabinet customer tray.This transformer is optional on single MMU systems and not present in paralleled MMU systems.230VAC power comes into the T8 Transformer from the T6 Transformer and protected by fuse F25. There are two different transformer configurations depending on if output power from the transformer to the modem is 115VAC or 230VAC.Removal
Perform steps in the Systems Operation, Testing and Adjusting, "Internal Component Preremoval Steps (Controls Cabinet)" in order to de-energize the system and gain access to internal components.
Remove wires from transformer by unscrewing the terminal screws with a cross tip screwdriver. The wires locations are labeled. Verify the labeling.
Remove the four cross head screws that connect the transformer to the left panel.Installation
Position the transformer in the cabinet in the location that is shown in Illustration 1.
Insert four cross head screws into the four corners of the transformer and secure the transformer to the left panel.
Illustration 2 g01277818
Modem Power Transformer (T8) 115VAC Wire Connections
Illustration 3 g01277819
Modem Power Transformer (T8) 230VAC Wire Connections
Attach wires as indicated by the labeling and by Illustration 2 for 115VAC power and Illustration 3 for 230VAC.